LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Difference between 93 LT1's & 94-97 LT1's

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Old 08-25-2008, 10:10 PM
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Originally Posted by Formula350
OK, correct there ARE T-Tops in 93. Just very few! It was Vert I must have been thinking.

1993 - Model Breakdown:No verts

Model----Total---Hard--TTop---A4-----M6--AR9--1LE--R6V--UP3
Firebird--(5006)--4622--384--.4434---572--N/A--N/A--N/A--302
Formula--(3985)--2929--300--3229---756--790-.--3---201--520
TransAm-(5121)--4282--839--4018---1103--?-----0---N/A--2369

Special Options: AR9 = Leather / 1LE = Perf. Suspension / R6V = Firehawk / UP3 = Compact Disc
Cool, Wow now I see that my 93 Formula is 1 of 300 cuz of T-Tops but I wonder how many with T-Tops also had the T-56 like mine. bet thats an even lower number. sweet haha
Old 08-25-2008, 10:19 PM
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My first 4th gen was '93 t/a. I remember there were some diff. the a4 on mine was 700r4 not 4l60e. since 93 was changeover year at least some had the 700. basicly the same trans just not electr.
Old 08-25-2008, 10:25 PM
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Originally Posted by '00 formula elesone
My first 4th gen was '93 t/a. I remember there were some diff. the a4 on mine was 700r4 not 4l60e. since 93 was changeover year at least some had the 700. basicly the same trans just not electr.
The 93 has a 4L60 (essentially a 700R4, all mechanical)
The 94-97 have a 4L60e (controlled by PCM)

My notes from chatting with Frank @ CPT on the subject:
A 4L60 (no E) is a 700R4. GM just changed the designation for 1993. The '93 F-Body unit has different valve body, spacer plate, and lock-up wiring than any previous 700R4, though. The reverse input housing is also specific to 1993.
Old 08-25-2008, 10:29 PM
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I didn't know that about the trans specifics being different. Interesting.
Old 08-25-2008, 10:36 PM
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Originally Posted by James Montigny
The 93 has a 4L60 (essentially a 700R4, all mechanical)
The 94-97 have a 4L60e (controlled by PCM)

My notes from chatting with Frank @ CPT on the subject:
Yea I know . That would be why I was bringing up the issue.......Right?
Old 08-25-2008, 10:38 PM
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Originally Posted by '00 formula elesone
Yea I know . That would be why I was bringing up the issue.......Right?
I think he's correcting you on the 700R4 bit. While technically it's a 700R4, I suppose now in light of that new info, calling it a 4L60 would be more accurate. Since it has unique parts to that year.
Old 08-25-2008, 10:44 PM
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Originally Posted by Formula350
I think he's correcting you on the 700R4 bit. While technically it's a 700R4, I suppose now in light of that new info, calling it a 4L60 would be more accurate. Since it has unique parts to that year.
6 to one or half dozen to another....whatever...... I was only trying to bring light to the fact of the diff in the "93" as to the 94-97 like the thread asked...... and thats what I did. And I am right.
Old 08-25-2008, 10:45 PM
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Originally Posted by Formula350
I think he's correcting you on the 700R4 bit. While technically it's a 700R4, I suppose now in light of that new info, calling it a 4L60 would be more accurate. Since it has unique parts to that year.
Just providing extra info, not trying to call anyone out or anything.
Old 08-26-2008, 10:15 AM
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Originally Posted by '00 formula elesone
6 to one or half dozen to another....whatever...... I was only trying to bring light to the fact of the diff in the "93" as to the 94-97 like the thread asked...... and thats what I did. And I am right.
Yes, you're right. James was just getting technicalities out of the way is all
Old 08-26-2008, 01:36 PM
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Part of the argument for the 93's being a tad faster than the other LT1 cars is because they had a slightly, and I mean SLIGHTLY larger camshaft. I can't remember where the specs are or else I would post them, but I have seen the comparison.
Old 08-26-2008, 04:37 PM
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Originally Posted by Jared 3870
Part of the argument for the 93's being a tad faster than the other LT1 cars is because they had a slightly, and I mean SLIGHTLY larger camshaft. I can't remember where the specs are or else I would post them, but I have seen the comparison.
93-95 202/207 0.300/0.307 116LSA
96-97 200/207 0.298/0.306 117LSA
Old 05-11-2010, 06:49 AM
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Originally Posted by Jared 3870
Part of the argument for the 93's being a tad faster than the other LT1 cars is because they had a slightly, and I mean SLIGHTLY larger camshaft. I can't remember where the specs are or else I would post them, but I have seen the comparison.
I believe the gears are different too. I know my stock 93 m6 is quite a bit quicker that the stock 97 m6 that the guy I bought mine off of has. He had both and he said the 93 was much quicker off the line. He kept the 97 because it was newer and had leather. He called me about a year later and wanted the 93 back. HAHA!!!
Old 05-11-2010, 07:54 AM
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Originally Posted by jeffs93z28
I believe the gears are different too. I know my stock 93 m6 is quite a bit quicker that the stock 97 m6 that the guy I bought mine off of has. He had both and he said the 93 was much quicker off the line. He kept the 97 because it was newer and had leather. He called me about a year later and wanted the 93 back. HAHA!!!
LOL old post is old. (why did you bump this)

Anyway, 93s with T56 also have more aggressive transmission gearing but only come with 2.73s or 3.23s in the 10 bolt.
Old 05-11-2010, 02:22 PM
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Is there any difference in the heads
Old 05-11-2010, 03:24 PM
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Originally Posted by BlackBird87
Is there any difference in the heads
Typically the 93's are the better heads to start from on a porting stand point, but other than that, they're the same......
Old 05-11-2010, 03:43 PM
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Originally Posted by duh
Typically the 93's are the better heads to start from on a porting stand point, but other than that, they're the same......
94-95 heads are a different casting # but just as good for porting.
Old 05-11-2010, 08:24 PM
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93 4l60/700r4 hard top torch red here, my 3rd 4th gen
Old 05-11-2010, 08:48 PM
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Originally Posted by duh
Typically the 93's are the better heads to start from on a porting stand point, but other than that, they're the same......
The 1996-97 casting 561 heads are not as good as the earlier heads (as cast).
Old 05-11-2010, 09:37 PM
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WHat is the RPM limit in the ECM n a 93?
Old 05-12-2010, 12:12 AM
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The intake and fuel system routing is different from all other F-body LT1 years.


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